The Life Of Birds: The Mastery of Flight

Free Documentaries Online

Free Documentaries Online

Find us on:
  

Who's Online

We have 272 guests and 9 members online


The Life Of Birds: The Mastery of Flight
Close Ad
Lights off
Rate:
0 ratings
Views: 611

From: silichip
Videos: 1981
Added: 08-09-2012 17:37:05
Broadcast 28 October 1998, the second programme deals with the mechanics of flight. Getting into the air is by far the most exhausting of a bird's activities, and Attenborough observes shearwaters in Japan that have taken to climbing trees to give them a good jumping-off point. The albatross is so large that it can only launch itself after a run-up to create a flow of air over its wings. A combination of aerodynamics and upward air currents (or thermals), together with the act of flapping or gliding is what keeps a bird aloft. Landing requires less energy but a greater degree of skill, particularly for a big bird, such as a swan. Weight is kept to a minimum by having a beak made of keratin instead of bone, a light frame, and a coat of feathers, which is maintained fastidiously. The peregrine falcon holds the record for being fastest in the air, diving at speeds of over 300 km/h. Conversely, the barn owl owes its predatory success to flying slowly, while the kestrel spots its quarry by hovering. However, the true specialists in this regard are the hummingbirds, whose wings beat at the rate of 25 times a second. The habits of migratory birds are explored. After stocking up with food during the brief summer of the north, such species will set off on huge journeys southwards. Some, such as snow geese, travel continuously, using both the stars and the sun for navigation. They are contrasted with hawks and vultures, which glide overland on warm air, and therefore have to stop overnight.
Url:
Embed:

Related Videos
0:49:18
Owner: silichip
Views: 478
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 521
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 601
Date: 08-09-2012
0:49:28
Owner: silichip
Views: 550
Date: 08-09-2012
0:49:11
Owner: silichip
Views: 577
Date: 08-09-2012
0:49:16
Owner: silichip
Views: 691
Date: 08-09-2012
0:49:17
Owner: silichip
Views: 534
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 744
Date: 08-09-2012
Owner: silichip
Views: 824
Date: 06-12-2010
Owner: silichip
Views: 2388
Date: 06-12-2010
Owner: silichip
Views: 1007
Date: 06-12-2010
0:53:28
Owner: silichip
Views: 1037
Date: 06-12-2010
Owner: silichip
Views: 1055
Date: 06-12-2010
Owner: silichip
Views: 958
Date: 06-12-2010
Owner: silichip
Views: 941
Date: 06-12-2010
Owner: silichip
Views: 805
Date: 06-12-2010
Owner: silichip
Views: 911
Date: 06-12-2010
Owner: silichip
Views: 1030
Date: 06-12-2010
Owner: silichip
Views: 922
Date: 06-12-2010
Owner: silichip
Views: 959
Date: 06-12-2010

Category
0:59:06
Owner: silichip
Views: 578
Date: 11-05-2013
0:58:34
Owner: silichip
Views: 1231
Date: 01-05-2013
0:59:05
Owner: silichip
Views: 793
Date: 01-05-2013
0:54:38
Owner: silichip
Views: 924
Date: 30-03-2013
0:54:27
Owner: silichip
Views: 492
Date: 30-03-2013
0:53:57
Owner: silichip
Views: 409
Date: 30-03-2013
0:54:29
Owner: silichip
Views: 399
Date: 30-03-2013
0:54:25
Owner: silichip
Views: 530
Date: 29-03-2013
0:57:59
Owner: silichip
Views: 952
Date: 29-03-2013
1:29:25
Owner: silichip
Views: 1316
Date: 22-03-2013
0:40:24
Owner: silichip
Views: 697
Date: 18-03-2013
0:54:32
Owner: silichip
Views: 798
Date: 09-03-2013
0:15:01
Owner: silichip
Views: 655
Date: 28-11-2012
0:48:24
Owner: silichip
Views: 852
Date: 24-11-2012
0:48:26
Owner: silichip
Views: 561
Date: 24-11-2012
0:48:09
Owner: silichip
Views: 520
Date: 24-11-2012
0:48:27
Owner: silichip
Views: 509
Date: 24-11-2012
0:26:48
Owner: silichip
Views: 593
Date: 20-11-2012
0:46:30
Owner: silichip
Views: 822
Date: 11-11-2012
0:58:35
Owner: silichip
Views: 778
Date: 20-10-2012
0:09:51
Owner: phillipernest
Views: 539
Date: 03-10-2012
0:01:30
Owner: phillipernest
Views: 705
Date: 03-10-2012
0:49:18
Owner: silichip
Views: 744
Date: 08-09-2012
0:49:17
Owner: silichip
Views: 611
Date: 08-09-2012
0:49:17
Owner: silichip
Views: 534
Date: 08-09-2012
0:49:16
Owner: silichip
Views: 691
Date: 08-09-2012
0:49:11
Owner: silichip
Views: 577
Date: 08-09-2012
0:49:28
Owner: silichip
Views: 550
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 601
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 521
Date: 08-09-2012
 
Free Joomla Templates: from JoomlaShack
Watch Free Movies